docs: def get_nagios_unit_name(relation_name='nrpe-external-master'):
      """
      Return the nagios unit name prepended with host_context if needed
  
      :param str relation_name: Name of relation nrpe sub joined to
      """
      host_context = get_nagios_hostcontext(relation_name)
      if host_context:
          unit = "%s:%s" % (host_context, local_unit())
      else:
          unit = local_unit()
      return unit